Bell-ringing circuit.



' -wih na'sses G. P. MODONNELL.

BELL RINGING CIRCUIT. APPLICATION nun DEQ.28.1905.

- Inventor: George P. M Dormell {W V Atsb'y's.

PATENTED DEC. 4, 1906.

UNITED STATES BATENT OF ICE.

GEORGE P. MoDONNELL, or sr.

LOUIS. MISSOURI, ASSIGNOR TO AMERICAN ELECTRIC COMPANY, OF EAST ORANGE, NEW JER- SEY, A CORPORATION OF NEW JERSEY.

BELL-RINGING CIRCUIT.

Specification of LettersPatent.

Patented Dec. 4, 1906.

Application filed December 28, 1905- Serial No. 293.696.

To all whom it may concern:

Be it known that I, GEORGE P. MCDON- NELL, a citizen of the United States, residing at St. Louis, Missouri, have invented a certain new and useful Im 'rovement in Bell- Ringing Circuits, of whic the following is a full, clear, and exact description, such as will enable others'skilled in the art to which it ap ertains to make and use the same, reference eing had to the accompanying drawings, forming part of this sp cification, in which- Figure 1 is a diagrammatic view illustrating my improved bell ringing circuit,-the switch being open; and Fig. 2 is a similar view with the switch closed.

This invention relates to a new and useful improvement in bell-ringing circuits, the ob ject being to operate said circuit from the main-line circuit of high voltage, the voltage of the bell-ringing circuit being cut down to such limits as will render it available for the demands made upon it. I

My present improvement is useful in con nection with electric street-cars and other places where thereis a high-voltage current capable of being reduced by the interposition of resistance to a small-voltage current useful for ringing bells or other like purposes.

With this object in view the invention consists in the construction, arrangement, and combination of the several parts,"all as will be hereinafter described, and afterward pointed out in the claims.

' In the drawings, 1 indicates the feed-wire from the inain-lme circuit, which connects with the resistance 2. Leading from wire 1 is a wire 3, which connects with a movable contact 4-such, for instance, as the armature of a relay-magnet. A spring 5 is preferably connected to armature 4, its energy being directed to moving said armature 4 against a fixed contact, from which leads a wire 6,

- tappingtheresistance 2 at some predeter mined point, depending upon the amount of resistance it is desired to leavein the bellrmging circuit when the switch is closed. It

'will be observed by reference to Fig. 2 that the wires 3 and 6 and. the armature 4 constitute a by-pass around part of the resistance 2, so that such part of said resistance is cut out or short-circuited when the relay-magnets are deenergized and the current passes through the bell-ringing circuit.

leads back to the main-line circuit.

Leading from the end of resistance 2 opposite to that to which the wire 1 is connected is a wire 7, which wire branches at 8 and 9, the former having in its length a magnet 10 of the bell-ringer and a switch 11, said wire connecting with the return-wire 1}, which Wire 9 includes in its length coils 12 of the relaymagnet, and when the switch 11 is open, as shown in Fig. 1, all the current passing through wire 7 is forced to pass through wire 9 and, the coils of the relay-magnet back to the return-wire 1*. When the switch 11 is closed, however, as shown in Fig. 2, coils 12 of the relay-magnet serve to shunt the current in wire 8 through the coil to the bellringing magnet and back to wire 1*, in this all the resistance 2, the current being thus.

cut down, so as to reduce the waste to a minimum, and only allow a sufiicient amount to ass to energize the coils 12 and normally tireak the by-pass.

From the above it will be seen'that when it is desired to ring the bell it is only necessary to close the switch 11, when part of. the resistance 2 will be cut out by theby-pass, and when the switch 11 is opened the by-pass will be opened and all the. resistance cut in.

I am aware that minor changes in the construction, arrangement, and combination of the several parts of my device can be made and substituted for those herein shown and described without inthe least departing from the nature and principle of my invention.

Having thus described the invention, what is claimed as new, and desired to be secured by Letters Patent,'is,

1. In a bell-ringing circuit, the combination with the main-line circuit of relatively high voltage, a resistance in said main-line circuit, a by'pass around part of said. resist- 5 closed said by pass Will be closed and the part of the resistance excluded by said bypass will be cut out; substantially as described.

2. In a' bell-ringing circuit, the combina- Io tionwith a main-line circuit, of a resistance therein, a by-pass around a part of said resistance, a magnetically-controlled element which forms part of said by-pass, a bell-ringing circuit, a switch in said bell-ringing c.ir'

r 5 cuit, and a ma net which is ener iized and deenergized by t e opening and c osing of the switch in the bell-ringing circuit, which magnet influences the element in said by-pass to cut in and cut out a part of the resistance 20 short-circuited by the by-pass; substan tially as described.

3. The combination withthe main-line circuit having a resistance therein, a by-pass around part of 'said resistance, an armature constituting part of said by-pass, means cooperating with said armature and tending to close said by-pass to cut out the part of the resistance excluded by said by-pass, a magnet cooperating with said armature, said magnet when energized operating said armature to open said by-pass, a bell-ringing circuit, and a switch in said bell-ringing circuit whereby when said switch is closed said magnet is denergized, and when said switch is open said ma net is energized; substantially as describe In testimony whereof I hereuntoaflix my signature, in the presence of two witnesses, this 23d day of December, 1905.

GEORGE P; MCDONNELL.

Witnesses LENORE WILsoN, GEORGE BAKEWELL. 

